Add README & make clean

Makefile

@@ -3,3 +3,7 @@ test.out: test.o
 
 test.o: test.cpp
 	g++ -Wall -pthread -O3 -c $<
+
+.PHONY: clean
+clean:
+	rm *.o *.out
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README.md

+# GSI Slurm CPU scaling test
+
+This project is intended to be used for debugging the CPU allocation / scheduling on the GSI 
+compute nodes while scaling the number of threads using `srun -n 1 -c $NUM_THREADS -- ./test $NUM_THREADS`
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